Article

Improved sensorless control of a permanent magnet machine using fundamental pulse width modulation excitation

Dept. of Electr. & Electron. Eng., Univ. of Nottingham, Nottingham, UK
IET Electric Power Applications (impact factor: 1.17). 05/2011; DOI:10.1049/iet-epa.2010.0108 pp.359 - 370
Source: IEEE Xplore

ABSTRACT A new method to estimate the rotor position of permanent magnet synchronous motor (PMSM) drives over a wide speed range, including zero frequency is introduced. The method measures the motor current derivative in response to the standard pulse width modulation (PWM) sequence to estimate rotor position. No additional signal injection or separate test vectors are required although modification is needed when narrow PWM voltage vectors occur. Three compensation techniques are proposed to improve the quality of the position estimation and reduce current distortion when narrow vectors are used for position estimation. Experimental results for sensorless speed and position control of a 4 kW PMSM verify the effectiveness of the proposed techniques.

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Keywords

4 kW PMSM verify
 
additional signal injection
 
current distortion
 
estimate rotor position
 
Experimental results
 
method measures
 
motor current derivative
 
narrow PWM voltage vectors
 
narrow vectors
 
permanent magnet synchronous motor
 
proposed techniques
 
rotor position
 
sensorless speed
 
separate test vectors
 
standard pulse width modulation
 
wide speed range
 

Y. Hua